Spark-plug.



E. U. HENN.

SPARK PLUG.

APPLICATION FILED JAN.4,1912.

1,073,%8, Patented Sept. 9, 1913.

WITNESSES Il'Ji/ENTOB ATTORNEY orena-e.

Aanur sermon.-

EDWIN o. nil-nu, oscLEvnLeNn, OHIO.

SPARK-PLUG.

To (iii-"whom it may; concern:

Be it known that I, Enwin C. ,HENN, a"

citizen of the United States, residing at (ilevela nd, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification.

This invention relates to ignition or spark plugs for internal combustion engines, the object of the invention being to provide an improved spark plug having a large firing or sparking. area in which the danger of corrosion is reduced to a minimum and the accumulation of oiland carbon deposits largely prevented, the plug being a compar-M 'atively simple and inexpensive one to procorresponding parts in the figures of the drawings.

So far as the general construction ofithe lug is concerned it maybe of'i'ny desired orm or structure. In the present instance it is illustrated as comprisin a centrally bored insulating core 2, which may be of porcelain or other material, surrounded by a chambered casing 3 which; is externally threaded, as at 4, for connectionwith the apparatus or engine in which it is to be used and internally threaded, as at 5,-for, the reception of an exteriorly threaded nut 6 by means of which the insulating ibody or core 2 and the casing 3 are firmly secured together. A suitable washer or packing, T

' may be used between the. shoulder 8 of the insulating core and theshoulder 90f vthe casing.

' Extending through the insulating body '2 is the electrode 9', which is provided with an enlarged tapered head 10 between which and the insulating body is located a suitable washer 11, and which electrode is secured in position by means of the usual nuts 12 and 13 turned on the threaded end 0" the electrode, and between which. nuts and the insulating body are also located suitable washers 14;. This terminal or electrode 9' is shown the form of a rod projecting an appreciable distance beyond the end of the Specification of Lettersi'atent.

Aiipficatinn filed :anuarys, 192a serials). 689,417..

Patented Sept. 9, 1913.

casing. The other electrodc comprises a coiled or spiral-formed member 15 comprising a plurality, or series ofcoils, the free end of which terminates'adjacent to the end of the first electrode 9 whildthe opposite end thereof, which maybe secured to the casing in any suitable manner, preferably term inates in a ring 16 of a size to fit tightly with-in the chambered casing 3', preferably adjacent to the end thereofisnd may also be secured therein in. anybuitable manner In the present instance it is shown as practically'encirclingtheentire inner wall of the casing and then bent or doubled upon itself to extend adjacentto the electrode 10' to encircle the same in spaced coils. The

with a suificient number of coils to extend from the outer end of the electrode 9 to within the chamber of the casing 3, so that such coiled electrode extends a number of times around the electrode 9. By this conobtained without increasing the length of the plug body or of the electrode 9, which is a material advantage in the manufacture and efficiency of the plug; Not only this, but the present improvement avoids a fixed sparking point or points and s0 reduces to a minimum the danger of corrosion or burning and the loss 'of the sparking or firing efficiency. Furthermore, as the tendency of a foreign matter is to follow the spiral toits base when the plug is placed in either a horizontal or "ertical' position in the engine cylinder,'the accumulation of spirally 'formed electrode 15' is provided 1 struction a large firing or sparking area'is oiland carbon is thus avoided, so that a clean contactportion 'is maintained at the proper point. In addition, as a large firing orv sparking portion is obtained it follows that any deposits of carbon or oil which may not follow the s iral to its base will not be suiiicient to inter e'rewith the operation of the plug and causemisfiring. In short, by the present improvedfform'of plug the spiral electrode will tend to free itself from oil or carbon deposits and also provides a large area of sparking surface, thus prolonging the longevity-of the plug to a considerable extent." l I claim as my invention:

' 1. A spark plug having an insulating body, a casing, and a pair of electrodes, one projecting beyond said body and the other spirally located around and throughout the body, a casing, and a palr of electrodes, one

projecting beyond said body and the casing and the other. comprising a continuous spirally Wound member carried by said casing and consisting of spaced coils encircling the first electrode from the casing to the end of such first electrode.

4. A spark plug comprising an insulating body, a casing, an electrode carried by said body and having a projecting part, and a spirally formed Wire electrode having a part inserted into and engaging said casing and having a seriesof spaced coils located around said first electrode and spaced therefrom and located within the plane of the Walls of the casing. v

5. A spark plug comprising a chambered casing, an electrode extending therethrough and insulated therefrom, and a spirally formed lectrode comprising a series of coils located around said first electrode and spaced therefrom and having an enlarged ring-formed base inserted within and engaging the Walls of the chamber of said casmg;

6. spark phi comprising a chambered casing, an electro e extending therethrough and lnsulated therefrom, and a spirally formed electrode comprising'a'ser'ies of coils located around said first *ol 'ectrode and spaced therefrom and having an enlarged ring-formed base inserted within and engaging the walls of the chamber of said casing, said spirally formed electrode comprising an integralwire-form'ed member.

portion Witnesses:

A spark plug comprising a chambered casing, 21. rod-formed electrodeextending therethrough and insulated therefrom and projecting beyond the end thereof, and-an lntegral wire formed electrode comprising a series of coilsxspirally located around said rod and spaced therefrom and terminatin in an enlargedring-shaped base secure within the chamber of said casing.

8. A spark plug 'comprismga rod projectmg beyond saidcasing and the other supported adjacent to 'tlie'end of the casing andlocated spirally around said rod casing, and'a pairof electrodes, one comprising-a I throughrpdt the length of the projecting the end ofsaid rod.

ereof-and terminating adjacent to 9. A spark plug comprising a body,"a conductorvvire mounted in said body and minal in spaced'relat'ion thereto to .pr'ov i'd'e a plurality of spaced coiled sparking su'rffaces arranged'in spaced relation one-above the other. e r

10. A spark plug comprising a body, a

terminal 'extendmgirom one end of the one end projecting therefrom and forming a termlnal, a spirally Wound terminal securedto the body and encircling the aforesaid ter- 7D body,-an,d a .second terminal secured to said body and consisting of a piece. of conducting materialcoiled intermediate its ends to provide inner and outer spaced coils to embrace the first-named terminal ln'spa'ced relation to theilatter 11. A spark plug'comprising'a body, a

nal, a spirally wound termiiidlisecuredy-to the body and bent upon itself ad acent to conductor mounted in said-body-and at one end projecting therefrom to ffiormuaif-termiits point of connection tothe body and-en-x circling the aforesaid terminal in spaced relation thereto to provide a plurality of spaced coiled sparking surfaces arranged in spaced-relation one above the other. -I

[Signed at-Cleveland, 'Ohio,-this 30th day. of Deeembeig 1911.. EDWIN .G.;HENN.

A. W. Horx us, I W. R. Mn'ci'rsm. 

